My notes include quotes, big ideas, and important lessons from the book. "Routinely sleeping less than six or seven hours a night demolishes your immune system, more than doubling your risk of cancer. Melatonin helps regulate the timing of when sleep occurs by signalling darkness throughout the organism, but has little influence on the generation of sleep itself.
Essentially everything Professor Walker asserts is backed up by evidence. More often than not, he not only states the source but will explain the details of the studies in question to explain his statements ... Summary of Why We Sleep By Matthew Walker | The New Science of Sleep and Dreams book.